desenvolvimento de bovinos de corte de diferentes grupos genéticos desmamados aos 3 ou 7 meses de idade performance of beef cattle of different genetic groups weaned at 3 or 7 months of age

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ID: 229025
1999
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Abstract
O objetivo deste experimento foi avaliar o desenvolvimento, até os 24 meses de idade, de machos de dois sistemas de acasalamento, puros (Charolês - C e Nelore - N) e cruzados ( 1/2 CN, 1/2 NC), submetidos a duas idades de desmame, T3 - desmame aos 3 meses de idade e T7 - desmame aos 7 meses de idade. Os animais foram mantidos do nascimento ao desmame com as vacas em pastagem nativa e, após o desmame, ambos os animais do T3 e T7 foram mantidos por um período de 30 dias em curral e alimentados no cocho. Os animais do T3, do 4º ao 7º mês, foram mantidos em pastagem de milheto (Pennisetum americanum). Os pesos aos 3, 7, 12, 18 e 24 meses de idade e os ganhos de peso médios diários (GMD) entre as diferentes idades foram coletados. Não houve interação entre o sistema de acasalamento ou grupo genético dentro do sistema de acasalamento e idade de desmame, para as variáveis estudadas. O GMD dos animais do T3 foi inferior dos 3 aos 7 meses e superior dos 7 aos 12 meses de idade; nas demais fases, não houve diferença no GMD. A única diferença para peso foi aos 7 meses, o qual foi superior para os animais do T7. O peso aos 24 meses foi 424 e 423 kg, respectivamente, para T3 e T7. Animais cruzados apresentaram maior GMD dos 7 aos 18 meses e foram mais pesados aos 18 e 24 meses. A heterose para GMD oscilou entre 0,6 e 29,9% e, para os pesos nas diferentes idades, entre -0,68 e 12,41%. Quando as condições de alimentação são adequadas, o desmame aos 3 meses não influi no peso de abate aos 24 meses de idade.
The objective of this experiment was to evaluate the performance up to 24 months of age of males from two breeding systems, straightbred (Charolais - C and Nellore - N) and crossbred (1/2 CN, 1/2 NC), submitted to two ages of weaning: T3-weaning at three months of age; T7-weaning at 7 months of age. The calves were maintained from birth to the weaning time with the cows on native pasture and, after weaning, both animals from T3 and T7 were maintained during a period of 30 days in a feedlot. The animals from T3, from 4 to 7 months, were maintained on pearl millet pasture (Pennisetum americanum). The weights at 3, 7, 12, 18 and 24 months of age and the average daily gain (ADG) among the different ages were collected. There was no interaction between the breeding system and genetic group within breeding system and age at weaning for the studied variables. The average daily gain of the T3 calves was lower from 3 to 7 months and higher from 7 to 12 months, afterward no difference was observed in the ADG. The only difference for weight was at 7 months, when T7 calves showed higher weight. The weight at 24 months was 424 and 423 kg, respectively, for T3 and T7. The crossbred animals showed higher ADG from 7 to 18 months and were heavier at 18 and 24 months. The heterosis for ADG ranged from .6 to 29.9%, and for weight at different ages ranged from -.68 to 12.41%. When the nutrition conditions are adequate, the weaning at 3 months does not affect slaughter weight at 24 months of age.
Reference Key
restle1999revistadesenvolvimento Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;João Restle;Volmir Antonio Polli;Dari Celestino Alves Filho;Dilceu Borges de Senna;Ricardo Zambarda Vaz;Régis Augusto Carvalho Bernardes;José Henrique Souza da Silva
Journal european journal of lipid science and technology
Year 1999
DOI
10.1590/S1516-35981999000500017
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35981999000500017
Keywords
heterosis crossbreeding nelore

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